#VU67910 Improper Verification of Cryptographic Signature in Cosign - CVE-2022-36056

Vulnerability identifier: #VU67910

Vulnerability risk: Medium

CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2022-36056

CWE-ID: CWE-347

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Cosign

Vendor: Sigstore

Description

The vulnerability allows a remote attacker to bypass implemented security restrictions.

The vulnerability exists due to improper verification of signature when processing artifacts. A remote attacker can supply a specially crafted artifact and bypass the implemented blob verification process.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Cosign: 0.1.0 - 1.11.1

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External links
https://github.com/sigstore/cosign/commit/80b79ed8b4d28ccbce3d279fd273606b5cddcc25
https://github.com/sigstore/cosign/security/advisories/GHSA-8gw7-4j42-w388

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.